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QA-62
Includes a dark gray 25 mm square 5 degress
rotated on a gray field. Surrounding grayscale
patches change in discrete steps from white
to black. Twenty patches are provided,
measuring 9x9 mm each. The four cornercrosses
measure 2.625" (66.68 mm) center
to center. The upper right grayscale patch
is equal in density to the background of the
rotated square (0.50 density). The lower left
grayscale patch is equal in density to the
center rotated square (1.10 density).